CBSE Questions for Class 10 Biology How Do Organisms Reproduce Quiz 3 - MCQExams.com

• Using condoms is the barrier method of birth control. Use of condoms block the sperm from entering the uterus. 
• Sexually transmitted diseases can be prevented by using condoms as they make a physiological barrier between two individuals and prevents the entry of sperm into the female body. 
• Thus, the correct answer is True.

• Amoeba, Spirogyra, and Yeast all reproduce by the asexual method. Amoeba reproduces by binary fission, Spirogyra by fragmentation, and Yeast by the budding method. 
• All are unicellular eukaryotic organisms.

• Reproduction can be defined as the biological process by which new individuals are produced from their parents. 
• Since, the new individuals contain the genetic material obtained from their parents, therefore, they are similar to their parents.

Correct Option: C

Explanation:

• The above figure is of planaria. 

• It represents the regenerative type of asexual reproduction. It is also seen in lizards’ tails, metazoans, etc.

•  In regeneration, each body part has the capability to give rise to the lost part.

• For example- the injured part or defective part of planaria will develop its rest body part with respect to the injured body part and form whole new individuals.

Hence, the figure represents the regeneration in planaria.

• A - represents vasa deferentia that transports sperm from the testes to the urethra.
• B - represents fallopian tubes or oviducts that play an important role in the transport and fertilization of the egg. 
• So, blockage at the site (A) and (B) interferes with the transport of gametes and will prevent pregnancy. 
• The surgical blocking of the vas deferens to prevent the passage of sperms is known as vasectomy. 
• The surgical blocking of the oviduct is known as tubectomy.

• All living organisms need the energy to grow and reproduce to maintain their structures and respond to their environments. 
• Reproduction is not necessary to maintain the life of an individual organism, unlike the essential life processes such as nutrition, respiration, or excretion.
• Also, to create more individuals like themselves, they will spend a lot of their energy in the process. 
• But still, it is important for the continued existence of that species.

• Budding is a type of asexual reproduction by which offspring arise from a single organism.

• Fragmentation is the form of asexual reproduction in which an organism is split into mature, fully grown individuals that are clones of the original organism.

• Multiple fission is that type of asexual reproduction in which the parental body divides into many daughter cells simultaneously during unfavourable conditions.
• So, the correct answer is option D.

• Barrier methods include the use of condoms, diaphragm, cervical caps, spermicides, sponges, etc, where sperms are protected by mechanical means to prevent entering the uterus.
• Hormonal methods or Chemical methods use hormones to regulate or stop ovulation and prevent pregnancy. These include various pills like combined oral contraceptives, progestin-only pill, injectable birth control, etc.
• An intrauterine device (IUD) is a small, T-shaped device that is inserted into the uterus to prevent pregnancy.
• Surgical methods include vasectomy (in males) where vasa deferentia are cut and tied while in tubal ligation (in females) the fallopian tubes are cut and tied so that the respective gametes are not transferred to the site of fertilisation.
  

• Hydra is a freshwater polyp that has a remarkable property to regenerate. It has the ability to re-grow the body parts which have been damaged and similar is the case with Planaria. 
• Both Hydra and Planaria use regeneration as a mode of producing new organisms. 
• Though lizards have the ability to regenerate lost parts of the body they lack the ability to reproduce through regeneration.

• A flower that lacks one or two of the 4 parts is called an incomplete flower.
• A bisexual flower has both stamen and pistil in the same flower.
• A unisexual flower has one of the reproductive organs, i.e. either stamen or pistil.